Thread-drawing machine



March 12, 1929. H. CORRALL ET AL THREAD DRAWING MACHINE Filed Aug. 26,1926 3 Sheets-Sheet l March 12, 1929. H, CORRALL ET AL THREAD DRAWINGMACHINE Filed Aug. 26, 1926 5 Sheets-Sheet 2 March 12, 1929. H. CORRALLET AL 1,704,881

THREAD DRAWI NG MACHINE Filed Aug. 26, 1926 {S Sheets-Sheet 5 fl lilll II IIIIIIIIIIIII/III. l 5' 21 I// c Patented Mar. 12, 1929.

UNITED STATES; ParseroFFic-E.'

HERBERT 60mm, or imam-sewa e, Y Ma James steam," or cmnnnami; seer LAND,Assr'enons so see snvena' MANUFACTURING COMPANY,- or ELIZABETH, NewJERSEY, A colironrl'rron or new JERSEY. w

THREAD-DRAWING. MACHINE.

Amman filed August 26, 1926, Serial at. 131,662, and in Great BritainSeptember 22, 1925.

This invention relates to improvements in machines for drawing threadsinfabrics to be hemstitched. I

'A machine for this purpose comprises a frame which may be constructedas a sewing machine frame iitted with operatively connected upper and"lower rotary shafts, fabricfeeding mechanism including a feed-dog,

a presser-bar with presser-feot, a vertically reciprocatingpiercer-barcarrying a spear} like piercer with a serrated edge,adapted to penetrateslots in the pressei feet and in the.

threat-plate transverse tothe .lineof the feed,

and a rotary cutter carried. by thelowe'r ro tary shaft and havmgacutting edge CllSPOSECl transversely of the direction of feed.

In accordance with the invention there is mounted for verticalreciprocation in the head of the arm of the frame, intermediate thepiercer bar andthe presser bar, a bar carrying a pair of flatfabric-depressing fingers with rounded lower edges, one on each side ofthe piercer, in line Withthe pivots of the presser-feet, these fingersbeing adapted to penetrate slots in the presser-feet and to enter slotsin the throat-plate extending in the direction of feed' i 7 Thisintermediate bar may be conveniently operated from a rock-shaft mountedin the head and deriving its actuation from an eccentric on the uppershaft, said rock-shaft having an arm disengagably connectible with theintermediate bar, the arrangement being such that in their descent thefingers engage the fabric at about the same time as the piercer, and,travelling aless distance, depress the fabric in the slots in thethroat-plate, reaching the lower limit of their stroke at about the sametime as the piercer, and releasing the fabric in their ascent to permitthe feeding movement following the Withdrawal of the piercer.

The action of the fingers is thus to stretch laterally the fabricclamped between the beneath the throat-plate, and these threads being 7thereupon severed.

The invention is illustrated in the accompanying drawings in which"Fig.1 is an end ele'vationof the head of the upper armwith the usualcoverrplate' removed, showing also the rotary cutter and feed-actuatingmechw. msm.' Flg. 2 1s a front sideelevation, part verticalsectionshowing, the operating parts adjacent to the head. Figs. 3 arias aredetail views of connections for operajting the finger-carrying bar.Figs. 5 an'dfi are de tail views of the fabric depressing fingers.

Fig. is a plan of the. throat-plate, below which is the feed-dog, Fig; 8is a plan of the feed-dog. Fig. 9 is aview ofthe lower end of the presser-bar'with presserfee't, the lati Fig;

ter being tilted to show the slots ther 10 is a part side elevationpartsection th oug'h the machine frame showing the connections between theupper drivin I er shafts. Fig. 11 is an inverted planpf the completemachine. Fig. is .a tffttllSVG s' vertical sectionin the plane of thepier c 1 -bar and Fig. 13' is a section Fig. 3.

on the line 18 -18,

a The mac-line illustrated o passes frame:

constructed as swing machine frame with" an upper rotary driving shaft 1operatively connected to a lower rotary shaft 2 and to a feed rock-shaft8 and a feed-lift rock-shaft 4. Mounted in the head 5 of the arm 6 ofthe frame is a presser bar 7 urged downwardly by a spring 8 and carryingtwin presser-feet 9, 10, in parallel adapted to tilt on horizontal axestransverse to thelines of feed, the shanks of said presser-feet beingconnected for reciprocal vertical movements by a balance member 10"journaled on a block 10 at the lower end of the presser-bar 7. The upperrotary shaft 1 is connected by a crank 11 and.

link 12 with a vertically reciprocating bar 13' located in front of thepresser-bar 7 as seen by the operator. Clamped to the lower end of thebar 13 by a screw 14 is a spear-like piercer 15 having a serrated edgeand adapted to penetrate registering slots 16 in the presserfeet 9, 10,and a slot 17 in the throat-plate '18 transverse to the line of thefeed. The lower rotary shaft 2 carries a rotary cutter-blade 19 having acutting edge disposed transversely of the direction of feed andcooperative with an edge 20 on the under side of the throatplate 18. i

' resser-bar 7 is a bar 21 carryinga pair of flat fabric-depressingfingers 22 with rounded lower edges, one on each side of the piercer 15,in the line joining the pivots 23 of the Presser-feet, these fingers 22being adapted to penetrate slots 24 inthe press'er-feet and to enterslots 25 in the throat-plate 18 parallel with the feed-slots therein.

The bar 21 is disengageably connected by an arm 27 with a rock-shaft 28mounted in the head and deriving its actuation through a bifurcatedarm-28 from an eccentric 29 on the upper shaft 1,, the arrangement beingsuch that in their descent the fingers 22 may engage the fabric at aboutthe same timeas the piercer 15, and, travelling a less distance, depressthe fabric in the slots 25 in the throatplate 18, reaching the lowerlimit of their stroke at about the same time as the piercer 15, andreleasing the fabric in their ascent to permit the feeding movementfollowing the withdrawal of the piercer.

The action of the fingers 22 is thus to stretch laterally the fabricclamped between the presser-feet 9, and the throat-plate 18 and to beacted on by the piercer and fed by the feed-dog 30. v V

The feed-dog 30 presents parallel series of serrations, comprising twoouter series 31, 82,

' one outside of each. finger 22, adapted to project through elongatedfeed-slots 33 in the throat-plate 18, each extending from a point infront to a point behind the path of the piercer 15, and two short seriesof serrations :34, 35 located between'the fingers 22 and adapted to pDject through intdrmediate feed-slots 36 in the throat-plate 18extending rearwardly from points behind the path of the piercer. i

As is understood, in the continued oper-, ation of the machine, thepiercer 15 makes a line of spaced penetrations in the fabric theserrated edge pushing the threads to be drawn'beneath the throat-plate18 for severance by the cutter 19 in rotation of the lower shaft 2. t

Having thus set forth the nature of the invention, what we claim hereinis 1. A thread-drawing machine having a throat-plate, a presser-bar anda vertically reciprocatory piercer-bar above the throatplate, a piercercarried by said pier cer-bar, vertically movable fabric-depressingfingers, one on each side of'said piercer, pressermeans carried by saidpresser-bar and formed with slots for said piercer and fabric-depressingfingers, said throat-plate also having slots for said piercer andfingers, a feeding device and rotary cutter below the throatplate, andmeans for reciprocating said lingers to project them through the slotsin the presser-means and'into the slots in the throatplate. 7

2. The combination set forth in claim 1 in which the finger actuatingmechanism is timed to'move the fingers into engagement with the workconcomitantly with the piercer, and thereafter to move the fingers alesser distance than the piercer is moved.

In. testimony whereof, we have signed our names to this specification.

HERBERT CORRALL. JAMES HEGGIE.

